MMC: Max blocks value adjustable
The maximum blocks value was hardcoded to 65535 due to a 16 bit
register length. The value can change for different platforms.
This patch makes the default the current value of 65535, but it
is configurable for other platforms.
Signed-off-by: Matt Waddel <matt.waddel@linaro.org>
Signed-off-by: Andy Fleming <afleming@freescale.com>
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 9988cb1..1355735 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -33,6 +33,11 @@
#include <mmc.h>
#include <div64.h>
+/* Set block count limit because of 16 bit register limit on some hardware*/
+#ifndef CONFIG_SYS_MMC_MAX_BLK_COUNT
+#define CONFIG_SYS_MMC_MAX_BLK_COUNT 65535
+#endif
+
static struct list_head mmc_devices;
static int cur_dev_num = -1;
@@ -139,11 +144,8 @@
return 0;
do {
- /*
- * The 65535 constraint comes from some hardware has
- * only 16 bit width block number counter
- */
- cur = (blocks_todo > 65535) ? 65535 : blocks_todo;
+ cur = (blocks_todo > CONFIG_SYS_MMC_MAX_BLK_COUNT) ?
+ CONFIG_SYS_MMC_MAX_BLK_COUNT : blocks_todo;
if(mmc_write_blocks(mmc, start, cur, src) != cur)
return 0;
blocks_todo -= cur;
@@ -215,11 +217,8 @@
return 0;
do {
- /*
- * The 65535 constraint comes from some hardware has
- * only 16 bit width block number counter
- */
- cur = (blocks_todo > 65535) ? 65535 : blocks_todo;
+ cur = (blocks_todo > CONFIG_SYS_MMC_MAX_BLK_COUNT) ?
+ CONFIG_SYS_MMC_MAX_BLK_COUNT : blocks_todo;
if(mmc_read_blocks(mmc, dst, start, cur) != cur)
return 0;
blocks_todo -= cur;